glTF-IBL-Sampler
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Lambertian distribution outputs black image?
Using this command line and the Khronos sample HDR:
cli.exe -inputPath footprint_court.hdr -distribution Lambertian -outCubeMap diffuse.ktx2 -outLUT lut_lambertian.png
The outputted lookup table is pure black:

Is this the correct behavior? Other distribution modes seem to output an image that looks as I would expect.
The sheen cubemap also seems to be pure black.